// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_PEPPER_AUDIO_HELPER_H_
#define CONTENT_RENDERER_PEPPER_AUDIO_HELPER_H_

#include <stddef.h>
#include <stdint.h>

#include <memory>

#include "base/macros.h"
#include "base/memory/shared_memory.h"
#include "base/sync_socket.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/shared_impl/resource.h"
#include "ppapi/shared_impl/scoped_pp_resource.h"
#include "ppapi/shared_impl/tracked_callback.h"

namespace content {

class AudioHelper {
public:
    AudioHelper();
    virtual ~AudioHelper();

    // Called when the stream is created.
    void StreamCreated(base::SharedMemoryHandle shared_memory_handle,
        size_t shared_memory_size_,
        base::SyncSocket::Handle socket);

    void SetCreateCallback(scoped_refptr<ppapi::TrackedCallback> create_callback);

protected:
    // TODO(viettrungluu): This is all very poorly thought out. Refactor.

    // To be called by implementations of |PPB_Audio_API|/|PPB_AudioInput_API|.
    int32_t GetSyncSocketImpl(int* sync_socket);
    int32_t GetSharedMemoryImpl(base::SharedMemory** shm, uint32_t* shm_size);

    // To be implemented by subclasses to call their |SetStreamInfo()|.
    virtual void OnSetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
        size_t shared_memory_size,
        base::SyncSocket::Handle socket_handle)
        = 0;

private:
    scoped_refptr<ppapi::TrackedCallback> create_callback_;

    // When a create callback is being issued, these will save the info for
    // querying from the callback. The proxy uses this to get the handles to the
    // other process instead of mapping them in the renderer. These will be
    // invalid all other times.
    std::unique_ptr<base::SharedMemory> shared_memory_for_create_callback_;
    size_t shared_memory_size_for_create_callback_;
    std::unique_ptr<base::SyncSocket> socket_for_create_callback_;

    DISALLOW_COPY_AND_ASSIGN(AudioHelper);
};

} // namespace content

#endif // CONTENT_RENDERER_PEPPER_AUDIO_HELPER_H_
